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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 8,279 | $ 8,250
Current period sales | 19,181 | 18,249
Revenue from amounts included in contract liability opening balances | (4,593) | (5,263)
Revenue from current period sales | (14,167) | (12,236)
Ending balance | $ 8,700 | $ 9,000

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